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/* ARM EABI compliant unwinding routines
   Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
   Contributed by Paul Brook
 
   This file is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3, or (at your option) any
   later version.
 
   This file is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
 
   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.
 
   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */
 
#include "unwind.h"
 
/* We add a prototype for abort here to avoid creating a dependency on
   target headers.  */
extern void abort (void);
 
typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
 
/* Misc constants.  */
#define R_IP    12
#define R_SP    13
#define R_LR    14
#define R_PC    15
 
#define uint32_highbit (((_uw) 1) << 31)
 
void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
 
/* Unwind descriptors.  */
 
typedef struct
{
  _uw16 length;
  _uw16 offset;
} EHT16;
 
typedef struct
{
  _uw length;
  _uw offset;
} EHT32;
 
/* Calculate the address encoded by a 31-bit self-relative offset at address
   P.  Copy of routine in unwind-arm.c.  */
 
static inline _uw
selfrel_offset31 (const _uw *p)
{
  _uw offset;
 
  offset = *p;
  /* Sign extend to 32 bits.  */
  if (offset & (1 << 30))
    offset |= 1u << 31;
 
  return offset + (_uw) p;
}
 
 
/* Personality routine helper functions.  */
 
#define CODE_FINISH (0xb0)
 
/* Return the next byte of unwinding information, or CODE_FINISH if there is
   no data remaining.  */
static inline _uw8
next_unwind_byte (__gnu_unwind_state * uws)
{
  _uw8 b;
 
  if (uws->bytes_left == 0)
    {
      /* Load another word */
      if (uws->words_left == 0)
        return CODE_FINISH; /* Nothing left.  */
      uws->words_left--;
      uws->data = *(uws->next++);
      uws->bytes_left = 3;
    }
  else
    uws->bytes_left--;
 
  /* Extract the most significant byte.  */
  b = (uws->data >> 24) & 0xff;
  uws->data <<= 8;
  return b;
}
 
/* Execute the unwinding instructions described by UWS.  */
_Unwind_Reason_Code
__gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)
{
  _uw op;
  int set_pc;
  _uw reg;
 
  set_pc = 0;
  for (;;)
    {
      op = next_unwind_byte (uws);
      if (op == CODE_FINISH)
        {
          /* If we haven't already set pc then copy it from lr.  */
          if (!set_pc)
            {
              _Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,
                               &reg);
              _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,
                               &reg);
              set_pc = 1;
            }
          /* Drop out of the loop.  */
          break;
        }
      if ((op & 0x80) == 0)
        {
          /* vsp = vsp +- (imm6 << 2 + 4).  */
          _uw offset;
 
          offset = ((op & 0x3f) << 2) + 4;
          _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          if (op & 0x40)
            reg -= offset;
          else
            reg += offset;
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
 
      if ((op & 0xf0) == 0x80)
        {
          op = (op << 8) | next_unwind_byte (uws);
          if (op == 0x8000)
            {
              /* Refuse to unwind.  */
              return _URC_FAILURE;
            }
          /* Pop r4-r15 under mask.  */
          op = (op << 4) & 0xfff0;
          if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)
              != _UVRSR_OK)
            return _URC_FAILURE;
          if (op & (1 << R_PC))
            set_pc = 1;
          continue;
        }
      if ((op & 0xf0) == 0x90)
        {
          op &= 0xf;
          if (op == 13 || op == 15)
            /* Reserved.  */
            return _URC_FAILURE;
          /* vsp = r[nnnn].  */
          _Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, &reg);
          _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);
          continue;
        }
      if ((op & 0xf0) == 0xa0)
        {
          /* Pop r4-r[4+nnn], [lr].  */
          _uw mask;
 
          mask = (0xff0 >> (7 - (op & 7))) & 0xff0;
          if (op & 8)
            mask |= (1 << R_LR);
          if (_Unwind_VRS_Pop (context, _UVRSC_CORE, mask, _UVRSD_UINT32)
              != _UVRSR_OK)
            return _URC_FAILURE;
          continue;
        }
      if ((op & 0xf0) == 0xb0)
        {
          /* op == 0xb0 already handled.  */
          if (op == 0xb1)
            {
              op = next_unwind_byte (uws);
              if (op == 0 || ((op & 0xf0) != 0))
                /* Spare.  */
                return _URC_FAILURE;
              /* Pop r0-r4 under mask.  */
              if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xb2)
            {
              /* vsp = vsp + 0x204 + (uleb128 << 2).  */
              int shift;
 
              _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
                               &reg);
              op = next_unwind_byte (uws);
              shift = 2;
              while (op & 0x80)
                {
                  reg += ((op & 0x7f) << shift);
                  shift += 7;
                  op = next_unwind_byte (uws);
                }
              reg += ((op & 0x7f) << shift) + 0x204;
              _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
                               &reg);
              continue;
            }
          if (op == 0xb3)
            {
              /* Pop VFP registers with fldmx.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if ((op & 0xfc) == 0xb4)
            {
              /* Pop FPA E[4]-E[4+nn].  */
              op = 0x40000 | ((op & 3) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          /* op & 0xf8 == 0xb8.  */
          /* Pop VFP D[8]-D[8+nnn] with fldmx.  */
          op = 0x80000 | ((op & 7) + 1);
          if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)
              != _UVRSR_OK)
            return _URC_FAILURE;
          continue;
        }
      if ((op & 0xf0) == 0xc0)
        {
          if (op == 0xc6)
            {
              /* Pop iWMMXt D registers.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xc7)
            {
              op = next_unwind_byte (uws);
              if (op == 0 || (op & 0xf0) != 0)
                /* Spare.  */
                return _URC_FAILURE;
              /* Pop iWMMXt wCGR{3,2,1,0} under mask.  */
              if (_Unwind_VRS_Pop (context, _UVRSC_WMMXC, op, _UVRSD_UINT32)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if ((op & 0xf8) == 0xc0)
            {
              /* Pop iWMMXt wR[10]-wR[10+nnn].  */
              op = 0xa0000 | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          if (op == 0xc8)
            {
#ifndef __VFP_FP__
              /* Pop FPA registers.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
#else
              /* Pop VFPv3 registers D[16+ssss]-D[16+ssss+cccc] with vldm.  */
              op = next_unwind_byte (uws);
              op = (((op & 0xf0) + 16) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
#endif
            }
          if (op == 0xc9)
            {
              /* Pop VFP registers with fldmd.  */
              op = next_unwind_byte (uws);
              op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
              if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)
                  != _UVRSR_OK)
                return _URC_FAILURE;
              continue;
            }
          /* Spare.  */
          return _URC_FAILURE;
        }
      if ((op & 0xf8) == 0xd0)
        {
          /* Pop VFP D[8]-D[8+nnn] with fldmd.  */
          op = 0x80000 | ((op & 7) + 1);
          if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)
              != _UVRSR_OK)
            return _URC_FAILURE;
          continue;
        }
      /* Spare.  */
      return _URC_FAILURE;
    }
  return _URC_OK;
}
 
 
/* Execute the unwinding instructions associated with a frame.  UCBP and
   CONTEXT are the current exception object and virtual CPU state
   respectively.  */
 
_Unwind_Reason_Code
__gnu_unwind_frame (_Unwind_Control_Block * ucbp, _Unwind_Context * context)
{
  _uw *ptr;
  __gnu_unwind_state uws;
 
  ptr = (_uw *) ucbp->pr_cache.ehtp;
  /* Skip over the personality routine address.  */
  ptr++;
  /* Setup the unwinder state.  */
  uws.data = (*ptr) << 8;
  uws.next = ptr + 1;
  uws.bytes_left = 3;
  uws.words_left = ((*ptr) >> 24) & 0xff;
 
  return __gnu_unwind_execute (context, &uws);
}
 
/* Get the _Unwind_Control_Block from an _Unwind_Context.  */
 
static inline _Unwind_Control_Block *
unwind_UCB_from_context (_Unwind_Context * context)
{
  return (_Unwind_Control_Block *) _Unwind_GetGR (context, R_IP);
}
 
/* Get the start address of the function being unwound.  */
 
_Unwind_Ptr
_Unwind_GetRegionStart (_Unwind_Context * context)
{
  _Unwind_Control_Block *ucbp;
 
  ucbp = unwind_UCB_from_context (context);
  return (_Unwind_Ptr) ucbp->pr_cache.fnstart;
}
 
/* Find the Language specific exception data.  */
 
void *
_Unwind_GetLanguageSpecificData (_Unwind_Context * context)
{
  _Unwind_Control_Block *ucbp;
  _uw *ptr;
 
  /* Get a pointer to the exception table entry.  */
  ucbp = unwind_UCB_from_context (context);
  ptr = (_uw *) ucbp->pr_cache.ehtp;
  /* Skip the personality routine address.  */
  ptr++;
  /* Skip the unwind opcodes.  */
  ptr += (((*ptr) >> 24) & 0xff) + 1;
 
  return ptr;
}
 
 
/* These two should never be used.  */
 
_Unwind_Ptr
_Unwind_GetDataRelBase (_Unwind_Context *context __attribute__ ((unused)))
{
  abort ();
}
 
_Unwind_Ptr
_Unwind_GetTextRelBase (_Unwind_Context *context __attribute__ ((unused)))
{
  abort ();
}

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgcc/] [config/] [arm/] [pr-support.c] - Blame information for rev 734

Line No.	Rev	Author	Line
1	734	jeremybenn	`/* ARM EABI compliant unwinding routines`
2			`Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.`
3			`Contributed by Paul Brook`
4
5			`This file is free software; you can redistribute it and/or modify it`
6			`under the terms of the GNU General Public License as published by the`
7			`Free Software Foundation; either version 3, or (at your option) any`
8			`later version.`
9
10			`This file is distributed in the hope that it will be useful, but`
11			`WITHOUT ANY WARRANTY; without even the implied warranty of`
12			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
13			`General Public License for more details.`
14
15			`Under Section 7 of GPL version 3, you are granted additional`
16			`permissions described in the GCC Runtime Library Exception, version`
17			`3.1, as published by the Free Software Foundation.`
18
19			`You should have received a copy of the GNU General Public License and`
20			`a copy of the GCC Runtime Library Exception along with this program;`
21			`see the files COPYING3 and COPYING.RUNTIME respectively. If not, see`
22			`<http://www.gnu.org/licenses/>. */`
23
24			`#include "unwind.h"`
25
26			`/* We add a prototype for abort here to avoid creating a dependency on`
27			`target headers. */`
28			`extern void abort (void);`
29
30			`typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */`
31
32			`/* Misc constants. */`
33			`#define R_IP 12`
34			`#define R_SP 13`
35			`#define R_LR 14`
36			`#define R_PC 15`
37
38			`#define uint32_highbit (((_uw) 1) << 31)`
39
40			`void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);`
41
42			`/* Unwind descriptors. */`
43
44			`typedef struct`
45			`{`
46			`_uw16 length;`
47			`_uw16 offset;`
48			`} EHT16;`
49
50			`typedef struct`
51			`{`
52			`_uw length;`
53			`_uw offset;`
54			`} EHT32;`
55
56			`/* Calculate the address encoded by a 31-bit self-relative offset at address`
57			`P. Copy of routine in unwind-arm.c. */`
58
59			`static inline _uw`
60			`selfrel_offset31 (const _uw *p)`
61			`{`
62			`_uw offset;`
63
64			`offset = *p;`
65			`/* Sign extend to 32 bits. */`
66			`if (offset & (1 << 30))`
67			`offset \|= 1u << 31;`
68
69			`return offset + (_uw) p;`
70			`}`
71
72
73			`/* Personality routine helper functions. */`
74
75			`#define CODE_FINISH (0xb0)`
76
77			`/* Return the next byte of unwinding information, or CODE_FINISH if there is`
78			`no data remaining. */`
79			`static inline _uw8`
80			`next_unwind_byte (__gnu_unwind_state * uws)`
81			`{`
82			`_uw8 b;`
83
84			`if (uws->bytes_left == 0)`
85			`{`
86			`/* Load another word */`
87			`if (uws->words_left == 0)`
88			`return CODE_FINISH; /* Nothing left. */`
89			`uws->words_left--;`
90			`uws->data = *(uws->next++);`
91			`uws->bytes_left = 3;`
92			`}`
93			`else`
94			`uws->bytes_left--;`
95
96			`/* Extract the most significant byte. */`
97			`b = (uws->data >> 24) & 0xff;`
98			`uws->data <<= 8;`
99			`return b;`
100			`}`
101
102			`/* Execute the unwinding instructions described by UWS. */`
103			`_Unwind_Reason_Code`
104			`__gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)`
105			`{`
106			`_uw op;`
107			`int set_pc;`
108			`_uw reg;`
109
110			`set_pc = 0;`
111			`for (;;)`
112			`{`
113			`op = next_unwind_byte (uws);`
114			`if (op == CODE_FINISH)`
115			`{`
116			`/* If we haven't already set pc then copy it from lr. */`
117			`if (!set_pc)`
118			`{`
119			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,`
120			`&reg);`
121			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,`
122			`&reg);`
123			`set_pc = 1;`
124			`}`
125			`/* Drop out of the loop. */`
126			`break;`
127			`}`
128			`if ((op & 0x80) == 0)`
129			`{`
130			`/* vsp = vsp +- (imm6 << 2 + 4). */`
131			`_uw offset;`
132
133			`offset = ((op & 0x3f) << 2) + 4;`
134			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
135			`if (op & 0x40)`
136			`reg -= offset;`
137			`else`
138			`reg += offset;`
139			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
140			`continue;`
141			`}`
142
143			`if ((op & 0xf0) == 0x80)`
144			`{`
145			`op = (op << 8) \| next_unwind_byte (uws);`
146			`if (op == 0x8000)`
147			`{`
148			`/* Refuse to unwind. */`
149			`return _URC_FAILURE;`
150			`}`
151			`/* Pop r4-r15 under mask. */`
152			`op = (op << 4) & 0xfff0;`
153			`if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)`
154			`!= _UVRSR_OK)`
155			`return _URC_FAILURE;`
156			`if (op & (1 << R_PC))`
157			`set_pc = 1;`
158			`continue;`
159			`}`
160			`if ((op & 0xf0) == 0x90)`
161			`{`
162			`op &= 0xf;`
163			`if (op == 13 \|\| op == 15)`
164			`/* Reserved. */`
165			`return _URC_FAILURE;`
166			`/* vsp = r[nnnn]. */`
167			`_Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, &reg);`
168			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &reg);`
169			`continue;`
170			`}`
171			`if ((op & 0xf0) == 0xa0)`
172			`{`
173			`/* Pop r4-r[4+nnn], [lr]. */`
174			`_uw mask;`
175
176			`mask = (0xff0 >> (7 - (op & 7))) & 0xff0;`
177			`if (op & 8)`
178			`mask \|= (1 << R_LR);`
179			`if (_Unwind_VRS_Pop (context, _UVRSC_CORE, mask, _UVRSD_UINT32)`
180			`!= _UVRSR_OK)`
181			`return _URC_FAILURE;`
182			`continue;`
183			`}`
184			`if ((op & 0xf0) == 0xb0)`
185			`{`
186			`/* op == 0xb0 already handled. */`
187			`if (op == 0xb1)`
188			`{`
189			`op = next_unwind_byte (uws);`
190			`if (op == 0 \|\| ((op & 0xf0) != 0))`
191			`/* Spare. */`
192			`return _URC_FAILURE;`
193			`/* Pop r0-r4 under mask. */`
194			`if (_Unwind_VRS_Pop (context, _UVRSC_CORE, op, _UVRSD_UINT32)`
195			`!= _UVRSR_OK)`
196			`return _URC_FAILURE;`
197			`continue;`
198			`}`
199			`if (op == 0xb2)`
200			`{`
201			`/* vsp = vsp + 0x204 + (uleb128 << 2). */`
202			`int shift;`
203
204			`_Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,`
205			`&reg);`
206			`op = next_unwind_byte (uws);`
207			`shift = 2;`
208			`while (op & 0x80)`
209			`{`
210			`reg += ((op & 0x7f) << shift);`
211			`shift += 7;`
212			`op = next_unwind_byte (uws);`
213			`}`
214			`reg += ((op & 0x7f) << shift) + 0x204;`
215			`_Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,`
216			`&reg);`
217			`continue;`
218			`}`
219			`if (op == 0xb3)`
220			`{`
221			`/* Pop VFP registers with fldmx. */`
222			`op = next_unwind_byte (uws);`
223			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
224			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)`
225			`!= _UVRSR_OK)`
226			`return _URC_FAILURE;`
227			`continue;`
228			`}`
229			`if ((op & 0xfc) == 0xb4)`
230			`{`
231			`/* Pop FPA E[4]-E[4+nn]. */`
232			`op = 0x40000 \| ((op & 3) + 1);`
233			`if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)`
234			`!= _UVRSR_OK)`
235			`return _URC_FAILURE;`
236			`continue;`
237			`}`
238			`/* op & 0xf8 == 0xb8. */`
239			`/* Pop VFP D[8]-D[8+nnn] with fldmx. */`
240			`op = 0x80000 \| ((op & 7) + 1);`
241			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_VFPX)`
242			`!= _UVRSR_OK)`
243			`return _URC_FAILURE;`
244			`continue;`
245			`}`
246			`if ((op & 0xf0) == 0xc0)`
247			`{`
248			`if (op == 0xc6)`
249			`{`
250			`/* Pop iWMMXt D registers. */`
251			`op = next_unwind_byte (uws);`
252			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
253			`if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)`
254			`!= _UVRSR_OK)`
255			`return _URC_FAILURE;`
256			`continue;`
257			`}`
258			`if (op == 0xc7)`
259			`{`
260			`op = next_unwind_byte (uws);`
261			`if (op == 0 \|\| (op & 0xf0) != 0)`
262			`/* Spare. */`
263			`return _URC_FAILURE;`
264			`/* Pop iWMMXt wCGR{3,2,1,0} under mask. */`
265			`if (_Unwind_VRS_Pop (context, _UVRSC_WMMXC, op, _UVRSD_UINT32)`
266			`!= _UVRSR_OK)`
267			`return _URC_FAILURE;`
268			`continue;`
269			`}`
270			`if ((op & 0xf8) == 0xc0)`
271			`{`
272			`/* Pop iWMMXt wR[10]-wR[10+nnn]. */`
273			`op = 0xa0000 \| ((op & 0xf) + 1);`
274			`if (_Unwind_VRS_Pop (context, _UVRSC_WMMXD, op, _UVRSD_UINT64)`
275			`!= _UVRSR_OK)`
276			`return _URC_FAILURE;`
277			`continue;`
278			`}`
279			`if (op == 0xc8)`
280			`{`
281			`#ifndef __VFP_FP__`
282			`/* Pop FPA registers. */`
283			`op = next_unwind_byte (uws);`
284			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
285			`if (_Unwind_VRS_Pop (context, _UVRSC_FPA, op, _UVRSD_FPAX)`
286			`!= _UVRSR_OK)`
287			`return _URC_FAILURE;`
288			`continue;`
289			`#else`
290			`/* Pop VFPv3 registers D[16+ssss]-D[16+ssss+cccc] with vldm. */`
291			`op = next_unwind_byte (uws);`
292			`op = (((op & 0xf0) + 16) << 12) \| ((op & 0xf) + 1);`
293			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)`
294			`!= _UVRSR_OK)`
295			`return _URC_FAILURE;`
296			`continue;`
297			`#endif`
298			`}`
299			`if (op == 0xc9)`
300			`{`
301			`/* Pop VFP registers with fldmd. */`
302			`op = next_unwind_byte (uws);`
303			`op = ((op & 0xf0) << 12) \| ((op & 0xf) + 1);`
304			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)`
305			`!= _UVRSR_OK)`
306			`return _URC_FAILURE;`
307			`continue;`
308			`}`
309			`/* Spare. */`
310			`return _URC_FAILURE;`
311			`}`
312			`if ((op & 0xf8) == 0xd0)`
313			`{`
314			`/* Pop VFP D[8]-D[8+nnn] with fldmd. */`
315			`op = 0x80000 \| ((op & 7) + 1);`
316			`if (_Unwind_VRS_Pop (context, _UVRSC_VFP, op, _UVRSD_DOUBLE)`
317			`!= _UVRSR_OK)`
318			`return _URC_FAILURE;`
319			`continue;`
320			`}`
321			`/* Spare. */`
322			`return _URC_FAILURE;`
323			`}`
324			`return _URC_OK;`
325			`}`
326
327
328			`/* Execute the unwinding instructions associated with a frame. UCBP and`
329			`CONTEXT are the current exception object and virtual CPU state`
330			`respectively. */`
331
332			`_Unwind_Reason_Code`
333			`__gnu_unwind_frame (_Unwind_Control_Block * ucbp, _Unwind_Context * context)`
334			`{`
335			`_uw *ptr;`
336			`__gnu_unwind_state uws;`
337
338			`ptr = (_uw *) ucbp->pr_cache.ehtp;`
339			`/* Skip over the personality routine address. */`
340			`ptr++;`
341			`/* Setup the unwinder state. */`
342			`uws.data = (*ptr) << 8;`
343			`uws.next = ptr + 1;`
344			`uws.bytes_left = 3;`
345			`uws.words_left = ((*ptr) >> 24) & 0xff;`
346
347			`return __gnu_unwind_execute (context, &uws);`
348			`}`
349
350			`/* Get the _Unwind_Control_Block from an _Unwind_Context. */`
351
352			`static inline _Unwind_Control_Block *`
353			`unwind_UCB_from_context (_Unwind_Context * context)`
354			`{`
355			`return (_Unwind_Control_Block *) _Unwind_GetGR (context, R_IP);`
356			`}`
357
358			`/* Get the start address of the function being unwound. */`
359
360			`_Unwind_Ptr`
361			`_Unwind_GetRegionStart (_Unwind_Context * context)`
362			`{`
363			`_Unwind_Control_Block *ucbp;`
364
365			`ucbp = unwind_UCB_from_context (context);`
366			`return (_Unwind_Ptr) ucbp->pr_cache.fnstart;`
367			`}`
368
369			`/* Find the Language specific exception data. */`
370
371			`void *`
372			`_Unwind_GetLanguageSpecificData (_Unwind_Context * context)`
373			`{`
374			`_Unwind_Control_Block *ucbp;`
375			`_uw *ptr;`
376
377			`/* Get a pointer to the exception table entry. */`
378			`ucbp = unwind_UCB_from_context (context);`
379			`ptr = (_uw *) ucbp->pr_cache.ehtp;`
380			`/* Skip the personality routine address. */`
381			`ptr++;`
382			`/* Skip the unwind opcodes. */`
383			`ptr += (((*ptr) >> 24) & 0xff) + 1;`
384
385			`return ptr;`
386			`}`
387
388
389			`/* These two should never be used. */`
390
391			`_Unwind_Ptr`
392			`_Unwind_GetDataRelBase (_Unwind_Context *context __attribute__ ((unused)))`
393			`{`
394			`abort ();`
395			`}`
396
397			`_Unwind_Ptr`
398			`_Unwind_GetTextRelBase (_Unwind_Context *context __attribute__ ((unused)))`
399			`{`
400			`abort ();`
401			`}`